Brake-shoe.



W. M. SIMPSON.

BRAKE SHOE.

APPLIUATION FILED mman, 1911.

1,027,081. rammed may 21, 1912.

WILLIAM M. SIMPSON, oF GHICAGO; ILLINOIS.

specification of Letters Patent.

BRAKE-SHOE.

,. Patented May 21, 1912.

, ,Application led March 30, 1911. SerialV No. 617,811.

To all whom it may concern:

Be it known that I, WILLIAM M. SIMPSON,

a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have, invented certain new, and useful Improvements in Brake-Shoes, of which the following is a specification. A This invention relates to railway brake shoes of that class which have a cast metal body reinforced or strengthened by a plate of Wrought iron, steel, or other suitably .tough materi-al located at or adjacent to the back ofthe bodyand an attaching lug made oftough ductile material anchored to the. shoe body. In shoes of this type the wrought' metal'attaching lug has heretofore been anchored to the shoe body bytucking the ends ofthe lug under thesides of the reinforcing plate and embedding these tucked-under ends in the cast body of the shoe. In practicethe. strap lug is formed with theinwardly projecting ends and the plate is engaged with this lug by tilting the plate and passing it through the opening be- -tween the ends and into thee'ye of the lug.

Owing to the limited dimensions of the eye of the strap lug it is necessaryto make thel opening between the ends' of the lug as wide aspossible to permit .the insertlon of the plate therein, as justdescribed, and hence these lends overlap the plate when the latter is properly arranged in the eye just suliciently to 'hold the plate in place during the operation of casting the body of the shoe y thereon. It has been found byan examination of l'commercial shoes of `this typel that t-he plate or lug has shifted in. the casting operation, yor the ends of thelug havebeen separatedniore than usual, and one of the ends is disengagedv from the plate `and only 4one end of the strap lug is tucked under the plate. Owing to thehigh braking lpressure.

now required bythe present heavy equipment these, a's well as. other Shoes, are often fractured in servlce, as well as 1n handling',

. V and the cracks or fractures most frequent-ly .occur near theV center of the body where the attaching lug is anchored. WVhen the shoes with the attaching lug ends tucked under the reinforcing plate, in the manner customarily employed in commercial practice as hereinabove described,` are thus fractured the lug and 'shoe willbe keasily separated under the strains Aof-.travel This notonly involves the loss `of the'shoe'A but may permit the body .between the body and the plate,

to fall in-a frog orswitch and bethe cause of a wreck.

It is theobject of my present invention to: l" produce a shoe having a wrought. metal at` taching lug so securely anchored to the shoe body that it can not be detached therefrom even if 'the shoe body sh'ould become crackedv orfractured.' This result is accomplshedby certain novel features of construction which will be best understood by reference to the following description when taken in connection with the accompanying drawings,

throughout the various views of which like reference characters refer to similar parts.

On the draw1ngs,rF1gure 1 is a planview showmg-the reinforcing plate and lug embodying my invention, the body being indicated in brokenlines. Fig. 2 is a longitudinal sectional view thereof. Fig.l 3 is a transverse sectional view on the line 3 3 of Fig. 2. Fig. 4 isa transverse sectional view on the ,line 4 4 of Fig. 2; and Fig.

5 is a plan view of a modified form reinforcing plate.'

Referring to the drawings, Gis the body of the brake shoe and it is made of cast ironofa` and of any approved shape. A reinforcing l plate 7 is disposed at or adjacent to the f back of the shoe body. said plate being of any well-known or desired contour having, if preferred, beveled edges 8. as shown in Fig. 1, and, if desired, notches 9 or other indentations or recesses to permit the cn-' trance of the metal of the shoe body for the purpose of forming a locking engagementform the plate is. also shown provided with Ink this longitudinally extending slots 10 and transi verse slots 17 into which the metal of the shoe body is permitted to ow. The end lugs 11 and the Guide lugs 1Q are also formed bythe body metal which flows up -aroundvthe sides and ends of the plat The attaching lug 13 consists of a Ametal strip or stra'pstanlped and bent to tbede-1 su'ed shape lllustrated 1n the d rawln gs. T he 'plate 7 is provided with a centrally disposed aperture'll through which the central pori -tion of the attaching lug is projected to "en.`

gage the lug` with the plate before the body of the shoe is cast thereon. The straplug illustrated in full lines in Fig. Qis ,entirely open at the sidesof thc shoe and the ends l5 of the lug are disposed beneath the plate and extend longitudinally thereof in oppositel j directions. l prefer that the ends 15 of the. lug should lie adjacent to and preferdrawai from the shoe through. the aperture I letin the reinforcing plate, the ends of the lug may be made Wider than the aperture 14, as shown in Fig. 1, thus providing shoulders 18 which engage with the plate at each side of the aperturelli and absolutely prevent the'lug and plate from be# ing separated by pulling the llugthrough the aperture,

The transversely extending sides of the attaching lug are provided with alined openings 19 through which the attaching key is inserted to secure the shoe to the brake head. These openings may be rnade 'of the required'size 4and sha-pe toreceive the key and without running the cast metal into or around the projecting portion of the lug, or'the attaching lug may be ern-l `bedded in the cast metal as indicated at 20 in Fig. ,3 to enlarge the dimensions of 4the lug and provide a key opening of proper size. Th51s cast iron is not. provided for the nir )ose of streno'thenin or reinforcinv L? the .ittacliii'ng` lug for that is notnecessary., the lug itself being sufficiently strongand rigid for all purposes. l

ln Fig. 5 I have shown another form of reinforcing plate which is designated 22, the plate in this instance being'madevvith straight edges neither beveled nor notched around its periphery. The .perforations 23 and Q4 into which the cast metal of the hoe body flows in the casting operation are shown as transversely extending slots and circular openings, respectively, although it' will be obvious that the number, size, shape and arrangementI of these perforations may between the plate and lug which is Wholly The unaifectedby fractures in the shoe. plate. and lug will reina-in in-locked` engagerncnt When the shoe body is Worn down to the degree 'which necessitates its ren snoval underthe M. C. B. requirements, and.

To fu-rl Learner this engagement will continue even if the body is entirely lost from the plate. The' body and plate are locked together as herein described, or in any other suitable inanner, and vivith the plate and lug permanently '-f) locked there is no chance for the shoe to fall away from the head in case of fracture. Thus my invention providesa, shoe which may be retained -in service until Worn out-,regardless of fractures, and it thereby reduces the cost of maintenance but increases the eiiiciency of the shoe. strap lug andv plate are made of .stro-ng` and substantial material which will not 'burn ont in casting and the lug 1s sufficiently 80 strong to stand all the'strains to which' 'brake shoe is subjected in service and. in

handling. The body metal may, as heretofore stated, 'be run up Within and alongside the strap lug if desired to malte the S5 lug conform to the retpiirementsl as'to certain dimensions imposed by the Master Car Builders and some railway companies, but otherwise it is unnecessary.

"What- I clailn and desire to secure by Letters Patent is:

l1. A brake shoe comprising a reinforcing. plate provided with an aperture, an attaching lug positioned in'said aperture With its ends disposed beneath the transverse Walls of said aperture, and a body cast on said plate.

2. A bralre shoe comprising a reinforcing plate provided With an aperture, an attaching lug positioned in'said aperture and hav- 1001l ing its ends disposed beneath the transverse Walls of said aperture and'extending in opposite directions beneath theplate', and 'a body cast on said plate.

j 3. A brake shoe comprising a reinforcing plate provided with an aperture, an attach- .ing l'ug positioned in said'aperture and having' its ends engaged with the un derside`.,.;A

4of said plate between said aperture and the plate. g

e. A brake shoe comprising-a reinforcing plate provided With anaperture, an attaching` lug formed of. a bent metal strap positioned in said aperture'and having` its ends 115 extending [lengthwise of vthe shoe beneath the plate, and a body cast'on said plate.

5. Abrake shoe comprising-a reinforcing v ends of the, plate, and a body caston. said plate providedvvith a centrally disposed aperture, an attaching'lug formed ofl a meta/1120 strap positioned in ,said'aperture, the ends. of said lug extending longitudinallyA of the shoe beneath and adjacent to` the underside of the plate', and a body cast'on said plate.

v6. A brake shoe comprising a reinforcing 125 plate provided Withan aperture and a bent.

strap lug positioned 1 in saidaperture With upstanding portions thereof extending itransrver'sely of' the Shoelld provided'vvitn .tray Openings, and a body cast on id phwai 7. A brake shoe comprising a reinforcing plate-provided with an aperture and a strap' lug positioned in. lsaid aperture with the protruding portions 'thereof extending transversely of the shoe and provided with openings and its .ends extending lengthwise of the shoe beneath said plate, and a body cast on said plat'e. 8. lA brake shoe comprising a reinforcing 'plate provided with an aperture, a strap lug positioned in said aperture and having end portions'of greater Width than said aperture anchored beneath the plate, and a body cast on said plate.

9. A brake shoe comprising a reinforcing platel provided with an aperture, a strap lug' positioned in said aperture with 'its ends projecting longitudinally ofthe shoe, said ends being Wider than the aperture to pre-v vent Withdrawal of the lug through theaperture, and a body cast on said plate.

410. A brake shoe comprising a reinforcing plate provided With an aperture, a strap lug positioned in said aperture with its ends extending lengthwise of the shoe beneath the plate, said yends and the plate being provlded .with perforations to receive the body metal, and a body cast on said plate.

11. A brake shoe comprising -a reinforcing plate provided with an aperture, a strap lug positioned in said aperture with its ends extending lengthwise of ,theV shoe beneath the plate, said ends 'and the adjacent portions of the plate being provided with registering perforations to receive the body metal, and a body cast on said plate.

'12.' Ay brakeshoe comprising a reinforcing plate provided 'with an aperture, a strap lug positioned in said aperture with its ends extending lengthwise of the. shoebeneath the plate, said ends and the adjacent pory tions ofthe plate being provided with 'registering perforations .to receive the body metal, they perforations in the plate being larger than those in the lug ends, and a body cast on said plate.

VILLIAM M.. SIMPSON. Witnesses:

`WM. O. BELT, M. A. Kinum. 

